<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>登陆页面</title>
  <style>
    html,
    body {
      margin: 0;
      padding: 0;
      height: 200vh;
      overflow-x: hidden;
    }

    .background {
      background-image: url("img/LoginBcakground.jpg");
      background-size: cover;
      background-position: 50% 50%;
      height: 200vh;
      font: 900 39rem '';
      line-height: 130vh;
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      position: relative;
      text-align: center;
      overflow: hidden;
    }

    .background::before {
      content: '';
      background-size: cover;
      background-image: inherit;
      background-position: 50% 50%;
      position: absolute;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
      z-index: -99;
    }

    h1 {
      position: absolute;
      text-align: center;
      width: 100%;
      letter-spacing: 10px;
      color: #fff;
    }

    h2 {
      position: absolute;
      letter-spacing: 2px;
      top: 120vh;
      width: 60%;
      color: #fff;
      left: 50%;
      transform: translateX(-50%);
      padding: 30px;
      background-color: rgba(0, 0, 0, .3);
    }
  </style>
</head>

<body>
<div class="background"><span>鹿行ERP</span></div>
<h2>
  In winter, it is covered with snow and snow. When you climb to Jinding, you can see far and wide, and the
  scenery is very magnificent; West overlooking Aiai snow peak, Gongga Mountain and Wawu mountain, the mountains
  connect the sky; Looking south at the top of Ten Thousand Buddhas, the clouds are rolling and the momentum is
  magnificent; A panoramic view of the Pingchuan River in the north is as beautiful as a shop, with a panoramic
  view of the Dadu River and Qingyi River
</h2>

<script>
  const background = document.querySelector(".background")

  document.addEventListener('scroll', () => {
    const scrollY = window.scrollY

    if (scrollY !== 0) {
      background.style.backgroundPosition = `calc(50% + ${scrollY}px) calc(50% + ${scrollY}px)`
    }else{
      background.style.backgroundPosition = ''
    }
  })
</script>
</body>

</html>